Unhelpful and unconcerned about client when travelling overseas

I am travelling out of the country and I have specifically asked Nedbank that my Credit Cards work without any problems at the selected countries. I phoned Nedbank and they confirmed that they will work.

To my horror, I needed to make an online purchase for an air ticket and Nedbank send me an OTP that never reached me. I have also tried to buy online train ticket and the same thing. I never get the OTP.

Then I chatted with an agent online under my Nedbank app and she said she cannot help me either. She just said Nedbank will contact me within 24 hours,

I told the agent that it is unreasonable for me to wait at my phone for 24 hours waiting for Nedbank to phone. It could be anytime in this time. Does Nedbank not understand that people also work, sleep, and do other things that they cannot be at the phone permanently.

Therefore I was not helped at all. The suggestions were unhelpful. I am still in limbo as I cannot make any online purchases.

Yet my account and credit card is and always has been in perfect order. And I did phoned Nedbank, before I left, and specifically requested that this does not happen.

Nedbank has no concern for me as a long term client. They simply left me in terrible situation without suggesting any solution. All they did was brushed me off with an unreasonable solution to be at the phone for 24 hours.

I am at a loss at what to do.